Symptoms
- Outside edge of tread is more worn than the center or inside
- Wear is noticeable on both front tires
- Tire feels or looks slightly rounded on the outer shoulder
Likely causes
- CommonUnderinflated tireLow pressure lets the tire flex and puts extra load on the outer edges.
- CommonAlignment out of spec (positive camber)The wheel leaning outward at the top wears the outer edge faster.
- PossibleFrequent hard corneringAggressive driving loads the outside shoulder more than normal driving.
- PossibleWorn suspension bushingsLoose bushings let the wheel shift position under cornering load.
What to do
- Check current tire pressure against the door jamb sticker, not the tire's max PSI.
- Correct pressure if it's low, and recheck in a week to see if the tire holds air.
- Look at your driving habits; frequent hard cornering accelerates this wear pattern.
- Have an alignment check done to rule out camber being out of spec.
- Ask the shop to check suspension bushings and control arms if alignment alone doesn't explain the wear.
Tools and parts
Replacement tires if wear is significantSearch: “tire size for [your car model]”
When to call a pro
If pressure and driving habits aren't the cause, have an alignment shop check camber and suspension components.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.